diff --git a/cfg/std.cfg b/cfg/std.cfg
index 9476e8b65..d67c17498 100644
--- a/cfg/std.cfg
+++ b/cfg/std.cfg
@@ -5969,6 +5969,18 @@ The obsolete function 'gets' is called. With 'gets' you'll get a buffer overrun
       <not-uninit/>
     </arg>
   </function>
+  <!-- std::ios_base::fmtflags std::ios_base::setf( std::ios_base::fmtflags flags ); -->
+  <!-- std::ios_base::fmtflags std::ios_base::setf( std::ios_base::fmtflags flags, std::ios_base::fmtflags mask ); -->
+  <!-- std::ios_base::fmtflags std::ostringstream::setf( std::ios_base::fmtflags flags ); -->
+  <!-- std::ios_base::fmtflags std::ostringstream::setf( std::ios_base::fmtflags flags, std::ios_base::fmtflags mask ); -->
+  <function name="std::ios_base::setf,std::ostringstream::setf">
+    <noreturn>false</noreturn>
+    <returnValue type="std::ios_base::fmtflags"/>
+    <leak-ignore/>
+    <arg nr="any">
+      <not-uninit/>
+    </arg>
+  </function>
   <!-- /*unspecified*/ setprecision(int n); -->
   <function name="setprecision,std::setprecision">
     <noreturn>false</noreturn>